Verified answer

Bonjour,

1)

5x=-3

x= -3/5

2)

4x+7 = -3x +6

4x +3x = 6-7

7x = -1

x = -1/7

3)

Soit

2x+3 = 0

2x= -3

x= -3/2

soit

x+6 = 0

x= -6

4

x²  = 125

x = √125

5)

8x +3x +21 = 3x +6

8x+3x-3x = 6-21

8x = -15

x = -15/8